Kiroshu

Rpm signal usually shows when the truck is having trouble starting. Have you checked the wires coming from the ignitor running across the top of the motor? See if they are damaged. And do those tests i mentioned.... you can't keep guessing little things... if you don't want to go through the proper tests then you will have a crappy running truck. Theres no magic fix for these things. And what do you mean when the idle gets low... the idle on normal operating temp for a 22r is about 750-850. Is it "seeking" a diff idle alot?

Kiroshu

Oh and believe Code 12 is:

-Ignitor
-Coil
-Distributor
-ECU

Trouble areas to look at.

oldblue94

Well... SHE RUNS LIKE A TOP!!!!!

While im not sure what exactly fixed it I did a few things before starting it up again and it ran beautiful.

1. Replaced wire going from coil to distributor (i tried pulling the old one off *after market* and both ends stripped out)
2. Checked connection at MAF sensor wiggled it around and made sure it was firmly in place.
3. Replaced the little plug-in thing on the coil that is held on by the mounting screw. ( idk what it is called maybe someone could chime in on it)

Now performs awesome, and really moves the 36's I got on there!

Thanks alot everyone for your input!! It really helped!!

yotaman85

i knew it had something to do with the coil.. I guess that makes me part idiot..

oldblue94

Haha yotaman well I did replace he coil from the junkyard so I gotta give it to ya

1990yota-pickup

the power wire tothe coil is a sentive piece, in my old truck it was a tiwsted up with some duct tape. i figured i would solder in some new wire.. will after that the truck wouldnt start. so i said the hell with in and put the orignial wire that had like 3 different splices in the wire. truck start 1st try afte hooking wire up...

Kiroshu

Could have very well been a pin hole in that coil wire. Code 12 was leaning you in the right place then Good deal though.

Trailmaster450

im having the same problem with my 91 pickup. i just put the motor in and did cap rotor plugs and wires, everything to specs. did the timing chain kiits too and seems to be in time but i had to advance it a little to drive it w/o it sputtering. im haveing the same problem as old blue94. TPS???

oldblue94

Well back to the same problem.... Any more ideas guys?

oldblue94

I also checked for stored codes again and got a code #12

RPM SIGNAL-NO SIGNAL TO ECU FROM DISTRIBUTOR ("Ne" OR "G") AFTER ENGINE HAS BEEN CRANKED
--DISTRIBUTOR/CIRCUIT

--STARTERSIGNAL CIRCUIT

--IGNITER/IGNITER CIRCUIT

--ECU

Do you think this could be a bad ECU?

yayfortrees

STOP!!!!!!

How many things have you skipped past? This is why mechanics get paid what they get paid. (Usually not enough)

Did you ever finish testing the TPS and MAF?!!!

Have you even bothered to look at the spark plugs yet?!!!

If you don't carry out each test to completion, you will never fix your truck! Diagnosing is a process of elimination. Go back and read this thread, and do what has been recommended. Figure out the ohm-meter, read the FSM, and put it on the TPS and MAF!

StaSta's_Yota

did anything ever come out of this because i have the same problem...i was going to pick up an msd coil for a bit more spark and maybe some more pep. dont kno if you ever ran into this but when it rains hard my 22re starts stumbling then if left to idle it dies like water is getting in my d cap. today i rtv'd the cap to see how that does.